Grinding device



May 17 1927.

W. STORCK GRI NDI NG DEVICE 4 Filed June 2. 1925 2. ai MM Patented May 17, 1927.

` UNITED STATES .WALTER STORCK, OF BERLIN, GERMANY.

GRINDING DEVICE.

Application tiled .Tune 2, 1925, Serial No. 34,352, and in Germany September 25, 1924.

When grinding a work-piece circularly it is carried preferably between dead or lixed centres in order to render ineffective eventual untrue running of the dead centres. The \vo1.'k-] )iece is rotated in such cases by the intermediary of a driving disk rotating upon a stationary pivot.

Internal grinding cannot, unfortunately, be eliected in the same manner because the supportinlr pivot for the above mentioned driving isk can be only comparatively short, and cannot, therefore, counteract suiiiciently the weight of the work-pieceit is to carry. The supporting members would inevitably be worn ott and the internal grinding would be unsatisfactory.

In connection with the driving of niachines by overhead countershatts, or overhead transmission gears respectively, devices have become known rendering possible alternate grinding between a dead centre and a rotating tool spindle. With machines ot' this kind the head stock or mandrel stock is provided with two pulleys, ot which one is keyed to the shaft, Whereas the other is `so devised as to be able to serve also as driving disk, and rotates loosely upon the work-piece spindle, which may be rendered stationary, it' desired, by means of a pin. When grinding between dead centres the driving belt is laid upon said other pulley and rotates the work-piece spindle, which carries on one of its ends the chuck provided for the recept-ion of the work-piece.

With circular grinding machines, which are operated singly' by mea-ns of a shaft. located in most cases in the interior ot the machine, and which do not require. therefore, an overhead counter-shaft gearing which can thus be dispensed with, arrangements and combinations of parts ot the above- Istated kind cannot be used. Instead thereof the new arrangement and combination of parts constituting the present invention is presented which consists of a headstock in which are supported two shafts which are equidistant from a vertical axle. liy reason ot this arrangement either the driving gear .for the dead centres or the driving gear for the bearing chuck may be turned towards the grinding disk without necessitating the actuation of any change-over mechanism or member.

My invention is illustrated diagrammatically and by way oit example on the accompanying drawing in which Figure 1 is a side-view of the improved grinding device, partly in vertical section; Figure 2 is a plan thereof, in horizontal. section, and Figure il a frontal view, seen lefthand with respect to Fig. 1.

The driving gear for the head stock, which is common for both kinds of use, is actuated by means ot a shaft 1, a bevel-wheel 2 aliixed thereto, a bevel-wheel 3 .meshing with the wheel 2, a shaft 4 to which the bevelwheel 3 is atlixed, a bevel-wheel 5 secured to the shaft Il, a bevel-wheel meshing with the wheel 5 and being liri'nly connected with a spur wheel 7, these two 'wheels ((5 and '7) being' aiiixed ,to a shaft 8. rl`he wheel 7 rotates a spur-wheel 9 keyed to a sleeve 1l) to which are keyed a plurality ot other spurwheels ot diii'erent diameters, as shown in Fig. :2, by which the rotary speed can be rcduced. These wheels serve itor operating a. draw-key gear which does not torni part of this invention and is, therefore, not dcscribed in detail in this speciiication. The draw-gear serves for rotating the sha-ft 12 whereby the means for interior grinding are prtwided. The other end ot the shatt 12 carries a spur-wheel 13 firmly connected therewith and nieshing with another spurwheel or 'worm wheel 1.4 which is so devised as to be adapted to serve also as a driver disk. The stationary centre 15 is located in the non-rotary spindle 16.

In order to change the manner of driving the headstock the three screws or bolts 1T shown in Figs. Q and il are loosened and the headstock is turned around the shaft si so as to change the position oi the parts concerned relatively to the grinding disk carrier as desired.

I claim:

1. In a machine tool, a headstock comprising a rotatable casing mounted on the frame oi' the tool, a fixed shaft mounted on the casing and carrying a dead centre, a rotatable shaft i'nounted onv the casing and carrying a chuck, and means permitting ro- 3. In the Combination specified in claim l, a driving disk mounted on said fixed 10 shaft,V and means for rotating said driving disk,

In testimony whereof I have :Llixed my signature.

WALTER STORCK. 

